Stack

public class AuthenticationStack : BaseStack
{
    public AuthenticationStack(INavigationService navigationService)
        : base(navigationService, new NavigationContainer(new NavigationPage()), Stacks.Authentication)
    {
    }

    protected override void Map()
    {
        _navigationService.Map(nameof(Authentication.Pin), typeof(PinPage), typeof(PinViewModel));
    }

    protected override string NavigationStartKey
    {
        get
        {
            return nameof(Authentication.Pin);
        }
    }
}